Quiz about Chemical Equilibrium

Question 1

What is true about chemical equilibrium?

Accepted Answer

All of above.

Answer

It is dynamic in nature

Answer

Rate of forward reaction = Rate of backward reaction at equilibrium

Answer

Composition of reactants and products do not change on reaching equilibrium

Question 2

Which of the following changes the equilibrium constant?

Accepted Answer

Temperature

Answer

Pressure

Answer

Concentration

Answer

Catalyst

Question 3

If the concentration of a reactant is increased then equilibrium shifts in

Accepted Answer

Forward direction

Answer

Backward direction

Answer

Forward direction for endothermic reaction

Answer

Backward direction for endothermic reaction

Question 4

If equilibrium constant for a forward reaction is 10 then equilibrium constant for the backward reaction is:

Accepted Answer

1/10

Answer

-10

Answer

10

Answer

0.01

Question 5

When the forward and reverse reactions are occurring at the same rate, the reaction is said to be at:

Accepted Answer

Chemical equilibrium

Answer

Chemical reaction

Answer

Chemical constant

Answer

Chemical peace

Question 6

When the rate of the forward reaction is equal to the rate of backward reaction, the system is said to be in

Accepted Answer

Chemical Equilibrium

Answer

Chemical Balance

Answer

Stoichiometry

Answer

Chemical Reaction

Question 7

TRUE or FALSE:

"At equilibrium, the CONCENTRATIONS of products STAY the SAME"

Accepted Answer

True

Answer

False

Question 8

For any reaction at chemical equilibrium, the concentrations of products and reactants

Accepted Answer

remain unchanged

Answer

are equal.

Answer

change

Answer

decrease

Question 9

Given the K_c for a forward reaction, how can you find K_c for the reverse reaction?

Accepted Answer

Divide 1 by K_c

Answer

Divide K_c by 1

Answer

Square Kc

Answer

Take the square root of K_c

Question 10

A very high value for K indicates that

Accepted Answer

products are favored.

Answer

reactants are favored.

Answer

equilibrium is reached slowly.

Answer

equilibrium has been reached

Question 11

TRUE or FALSE:

"At equilibrium, the CONCENTRATIONS of reactants and products are EQUAL"

Accepted Answer

True

Answer

False

Question 12

What are the two factors to look for when determining if the reaction is at equilibrium?

Accepted Answer

Forward and reverse reaction rates are equal and concentration is constant

Answer

Forward reaction rate is faster than the reverse and concentrations are equal

Answer

Forward and revers reaction rates are equal and concentration is equal

Answer

Forward reaction rate is faster than the reverse and concentration is equal

Question 13

TRUE or FALSE:

"At equilibrium, the RATES of the forward and reverse reactions are EQUAL"

Accepted Answer

True

Answer

False

Question 14

Why is equilibrium called a dynamic state?

Accepted Answer

The reactions at equilibrium continue to take place once equilibrium is established.

Answer

Chemists try to convert as much reactants as possible into products.

Answer

The products of a forward reaction are favored, so equilibrium lies to the right.

Answer

All chemical reactions are considered to be reversible under suitable conditions.

Question 15

Which of the following statements correctly describes any chemical reaction that has reached equilibrium?

Accepted Answer

The rates of the forward and reverse reactions are equal.

Answer

The reaction is now irreversible.

Answer

Both forward and reverse reactions have halted.

Answer

The concentrations of products and reactants are equal.

Question 16

An exothermic reaction is allowed to reach equilibrium. If heat energy is then removed, the equilibrium will shift

Accepted Answer

toward the product side

Answer

toward the middle

Answer

toward the reactant side

Question 17

$$For\ the\ reaction:\ CH_4\ \left(g\right)+\ O_2\ \ \left(g\right)\rightarrow\ CO_2\ \left(g\right)+\ 2H_2O\ \left(g\right)$$ forward reaction is favoured by

Accepted Answer

Decrease in pressure

Answer

Increase in pressure

Answer

No impact of pressure

Answer

Equilibrium constant changes

Question 18

Which of the following statements is true about a chemical system at equilibrium?

Accepted Answer

The rates of the forward and reverse reactions are equal.

Answer

The concentrations of reactants and products are equal.

Answer

The forward and reverse reactions have stopped.

Answer

The equilibrium constant is zero.

Question 19

What happens to the position of equilibrium when the temperature of an exothermic reaction is increased?

Accepted Answer

Shifts to the left, favoring reactants.

Answer

Shifts to the right, favoring products.

Answer

Remains unchanged.

Answer

Equilibrium constant increases.

Question 20

In a chemical equilibrium involving gases, what effect does increasing the pressure have on the system?

Accepted Answer

Shifts equilibrium towards the side with fewer moles of gas.

Answer

Shifts equilibrium towards the side with more moles of gas.

Answer

No effect on equilibrium position.

Answer

Increases the equilibrium constant.

Question 21

Which of the following is a characteristic of a dynamic equilibrium?

Accepted Answer

The forward and reverse reactions occur at the same rate.

Answer

The reaction has stopped completely.

Answer

The concentrations of reactants and products are constantly changing.

Answer

The equilibrium constant is changing.

Question 22

For the reaction @@N_2(g) + 3H_2(g) ightleftharpoons 2NH_3(g) $$, what is the effect of adding more $$ H_2@@ to the system at equilibrium?

Accepted Answer

Shifts equilibrium to the right, producing more $$NH_3$$ .

Answer

Shifts equilibrium to the left, producing more $$N_2$$ and $$H_2$$ .

Answer

No change in equilibrium position.

Answer

Decreases the equilibrium constant.

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